A plot could revolve around the idea that Cordelia's pregnancy is seen as a symbol of something greater in the Fire Emblem universe. Maybe it's prophesied that their child will bring great change. So, there are forces that want to either protect or harm Cordelia and the unborn baby. Robin has to use his strategic skills not only in battle but also to safeguard his family. The story could also include Cordelia's own journey of self - discovery during pregnancy, how she grows stronger and more determined to be a mother and a fighter for her new family.
The plot could start with Robin and Cordelia having a secret relationship. When Cordelia finds out she's pregnant, they have to decide whether to keep it a secret or announce it. There could be drama from other characters who might have different opinions. Some might see it as a sign of hope for the future, while others could view it as a distraction in the midst of their struggles. As the pregnancy progresses, they face challenges like finding a safe place for Cordelia to give birth and dealing with potential threats to their family.
One possible plot could be that Robin and Cordelia are in the middle of a war - torn situation in the Fire Emblem world. They discover Cordelia is pregnant, and this news makes them reevaluate their roles in the war. Robin might become more cautious in battle, not wanting to leave Cordelia alone. And Cordelia could be determined to still contribute to the cause while protecting her unborn child.